Manufacture of artificial silk



Dgc. 22, 1936. ESSELMANN 2,064,897

MANUFACTURE OF ARTIFICIAL SILK Filed Ju1y26, 1934 .emmwuyj Patented Dec. 22, 1936 UNITED STATES PATENT OFFICE MANUFACTURE OF ARTIFICIAL SILK Application July 26, 1934, Serial No. 737,121 In Germany July 28, 1933 3 Claims.

My present invention relates to the manufacture of artificial silk and more particularly to an improvement in the manufacture of artificial silk according to the bobbin spinning system.

One of its objects is an improvement in the manufacture of artificial silk according to the bobbin spinning system which is efficient and which avoids certain drawbacks involved with the bobbin spinning process as hitherto in use.

Further objects will be seen from the detailed specification following hereafter.

Reference is made to the accompanying drawing in which Figs. 1, 2 and 3i1lustrate the process according to this invention.

Fig. 1 shows twisting in a centrifugal box according to this invention;

Fig. 2 shows a side view of an arrangement for spinning on a plate rotating about its axis and simultaneously performing a reciprocating movement, and

Fig. 3 shows a front view of the arrangement shown in Fig. 2.

' According to this invention the de-acidified and dried, or de-acidified, after treated and dried, viscose artificial silk wound on bobbins is not a twisted on twisting spools as usual, but, while it is twisted, is brought into theform of a winding, in which operation there are used an ordinary twisting spindle and for receiving the threads a reciprocating plate or a centrifuge box.

Such rotating and changing devices for winding the twisted thread are described, for example, in German Patent No. 169,906 or British Patent No. 414,991. If the silk on the spool is only deacidified and dried, the after-treatment is applied after the twisting process to the centrifuge cakes or to the shapeless windings produced on the plates. The windings produced by the abovementioned mode of operation can forthwith be improved or they can be put directly on the market and supplied to the consumer.

The process of the invention renders it possible to produce marketable windings of great length of thread by a shortened and cheaper process.

The twisting process is essentially simpler and does not require the same great attention as does the known stage or ring-twisting machine. It is of essential importance that the silk should be moistened before it is received in the form of a cake or shapeless winding. By this means,

particularly in the case of completely aftertreated and dried spool silk, the inner tensions of the thread are again completely compensated so that the silk can subsequently be ready for any sphere of application in the industry. The same applies to the merely de-acidified silkwhich is subsequently after-treated until finished in the form of a winding or a cake and also dried while avoiding any tension.

The following examples illustrate the invention:

Example 1.Artificial silk made from viscose which, in the spinning process is wound on spools, is freed from sulfur on these spools by means of a suction-washing treatment, aftertreated until finished, and dried. From the rapidly rotating spool placed on a twisting spindle the dried silk is drawn ofi overhead or by unrolling over a roller or a draft device consisting of a number of rollers, is thoroughly wetted on or behind this drawing-off member by means of a wet sponge or a-thread guide which is kept wet, and is deposited on a plate disc which is driven by planet gearing. The winding thus formed can, after drying, be used directly on the manufacturing machines. With this object in view it may be deposited on a suitable plate having a conical retaining device.

Alternatively, the viscose artificial silk may be 25 de-acidified and dried on the spinning spool and then twisted in the manner described and deposited on a plate disc in the form of a winding.

In this case the entire after-treatment is applied only to the finished winding. The known meth- 30 ods in which the windings are either irrigated or cleaned by means of sucking or'forcing the treating liquid through them, may be adopted. Furthermore, in this case, the windings are advantageously either bound underneath with threads or are covered with permeable cloths, in order that they may be protected as much as possible during treatment.

Example 2.Viscose'artificial silk spun on a spool is de-acidified in known manner, aftertreated until finished anddried. The thread is then withdrawn overhead from the spool or unrolled, and twisted in a centrifugal box. After it has passed the removing device, which may 'consist of a roller or a number of rollers, the

thread is thoroughly wetted with water or soap solution. The box of the centrifuge is preferably made of light material, for example of perforated sheet aluminium, and can be built in an ordinary twisting machine, and driven by a belt. Its diameter may be such that within the cake of thread produced there is room for the insertion of a thick conical pin, which is' transferred, with the cake on'it, to the manufacturing machine. When spinning spools are used which are only de-acidified but not freed from sulfur, the

cake produced in the centrifugal box is subse quently subjected to the usual cleaning process according to one of the known methods.

What I claim is: 1. vIn the manufacture of artificial silk according to the bobbin spinning system wherein spun thread is wound on a bobbin, deacidified and dried, the improvement which comprises drawing the dry thread 01f the bobbin by passing the same over a draft device, simultaneously rotating the bobbin at a sufficient speed to impart twist to the thread, wetting the twisted thread and imparting additional twist to the wetted thread while collecting the same. in the form of an unsupported winding or cake.

' 2. In the manufacture of artificial silk according to the bobbin spinning system wherein spun thread is wound on a bobbin, deacidified and dried, the improvement which comprises drawing the dry thread oi the bobbin by passing 'ing the dry thread OK the bobbin by passing the same over a draft device, simultaneously rotating the bobbin at a sufficient speed to impart twist to the thread, wetting the twisted threadand forwarding the wetted thread to a centrifugal box whereby the thread is given additional twist and is collected in the form of an unsupported winding or cake.

PAUL ESSELMANN. 20 

